During opposition, the horizontal parallax of Jupiter was 2.1 “. Determine its linear radius if the angular radius is 23.4”

During opposition, the horizontal parallax of Jupiter was 2.1 “. Determine its linear radius if the angular radius is 23.4” and the radius of the Earth is 6400 km.

decision
r = p / p0 * R; r = 23.4 * 6400 / 2.1 = 71300 (km).

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